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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d1009c54487832354aea60215277d72097c6e1e0da7111852956cc837da5dd' 
  AND token = 'rKi1sJ8M1+rVIy9N0dbQ8lOSbp6NvTn79Ym4J+8+6so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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