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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06eb2e77906643acf1f3aaa22328f9525515aa6d0062166fa22a1c04df4dbb7' 
  AND token = '/kjkSUP8pNd0ewe355b/HGSwBaWHAovhUWNIIR/M8sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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