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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc9b947ce16fa41b73efd4a9204994d2b3bd31bbb53a2c4adc873327590dd0d' 
  AND token = '7jDmC/Apurws+d86Eyc1yJo0+3NqnJD1QOgzII/Fsvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}