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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeefce6e06c126218dcc4441dc3c3da49971e028c6ffa3f90df5a215b1068fb5' 
  AND token = 'lSFBx/j4t+2SDrohViZrKTWt8N1G5vxihfxTFXyQ8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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