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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f1d687a2568c62c141c2e211396bd2ba5e74e4e8963234afa4abd591c01802' 
  AND token = 'uDIRh3EiZ0ORxYZQCiI8Uv/KO+gZieR2bAUmDsf4wyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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