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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3042c282f69f8f0b9219a1ebfc0f9cd6e65c39d4f707233dcc9793e73a7fb57a' 
  AND token = '3ze1p5FhAU8bg3fF6AwevuwG3Cad7lWaq40vY9gxrI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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