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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e4584b1ba758765fcae3d0f0755c71b8f7fe3cb64cb05ae56c0867809c84ca' 
  AND token = '2Yr4izPwObEhhyP3EURw8orBW1og5HX2/NUkKOtqdv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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