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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fc9b22f8208a6c98f4f2fadd5e1322a3a17c49a5dcf725eec0547f469e775f' 
  AND token = 'cTmgyZFJtorN1PLZc/Pg5a88nNaCWHSrCCPG1U9ZXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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