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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070538418c8a8ea4179dbaab236292b81d530d777bade1d6d9feb7e358c60275' 
  AND token = 'FCthC/qS3P6v1xf2QK+aH3WvqR24MAe0eNSFnr/KMk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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