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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ac90432acee6b1707d0c7fff3e6fba0f7a49316f90936cb0b5663b06d8d180a' 
  AND token = 'z1T5kFozsresH1U4GERtEzV6C2wnQwgh+r6MBQPvl+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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