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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9668e82a17d49b9909cb4c1293ecaf241eba92088e6715945d01e2d3b814ebeb' 
  AND token = 'IrJp3cUtlEOAzWF7pngM3w+oQRGLF2NcdR5CBr34QDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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