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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73efdcb6f8d6819e83106cf7d56825e86969cd5df35339d6b52fd659f012e16b' 
  AND token = '7IJ5OfjGSylsPocT8ntG1rAMkFAT1++tKpqDFqTgj6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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