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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556554a7c9da2d10d277c409a28782deda831cc524e7a8d631494b7d359a6162' 
  AND token = '0k9SwDI1+Ow7PTfsrn8YJ+G4pzCiadm38CK437OKSpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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