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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cc1d56568f498980bf5b091c80103ccf02d148c299fd1543ad1326dd986669' 
  AND token = '283Yx7oR2HcYwrQmG/Iw3E8N6AfweesHqR8lu0uMLZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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