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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe3f193eab8a0492bb750f23df10d8a1960da6c9352e56887c03871347b92c5e' 
  AND token = 'i2Lq44kEO593yHvUd4KAVnt/aawDe/fVi8gkQ5Qa8RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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