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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58ab111aa93136b7d1c845458c53a1cadd8433d5edc5d177eebdbd12834da0d' 
  AND token = 'nCa1m4OvK3C6FxT4C+/11hHDseoiNhnvntC2YiHUM0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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