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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc972e158770954a487ee46767f5ec66c2d6ec63e2b51a2c10e12afc5aaf5bc' 
  AND token = 'j2x2f7nPaJC4i7+9NQ73vUsK/TXt9VKBX9/vrenMP94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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